The plastisphere is a newly recognized geospheric layer at a planetary scale, characterized by the presence of microorganisms, primarily as biofilms, that colonize inert and poorly decomposable organic matter, particularly plastics. The stability and diversity of substrate plastic fosters a consistent evolutionary trend among microorganisms, leading to specialized ecological niches that enhance particular physiological traits for plastic degradation. Biofilms have been observed on various types of plastics, including both conventional petroleum-based polymers (like polyethylene and polystyrene) and bioplastics (such as polyhydroxyalkanoates). The characterization of plastisphere objects is crucial and should be conducted with geodetic referencing and spatio-temporal metrics to understand the impacts of climatic and meteorological factors. The dynamic nature of species succession in response to environmental changes necessitates advanced analyzes of microbial communities' potential for plastic degradation. The spatial turnover of core and occasional taxa complicates the precise identification of microbial functions within these communities. The question of "Who is where in the plastisphere?" emphasizes the need for detailed biogeographical and chemical mapping due to the small size and localized nature of microplastic particles. It is important to differentiate when plastics serve as growth resources (biodegrading) versus mere substrates for microbial growth, raising the question of "Food or just a free ride?". The geochemical and aerochemical activities within the plastisphere are crucial for understanding its broader environmental impacts. These activities include nitrogen metabolism and the biogeochemical cycling of nitrogen, phosphorus, and carbon, which encompasses greenhouse gas emissions associated with plastic degradation. Additionally, trace metals can accumulate in the plastisphere, potentially facilitating photo-Fenton processes that may occur on microplastic surfaces when exposed to sunlight.